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Clarification on Summary Report output item?

asked 2017-02-16 15:21:10 -0500

Ed May's avatar

updated 2017-02-18 23:30:22 -0500

I'm new to EnergyPlus modeling and I'm wondering if anyone could clarify something for me on the results of a model I am working on? In a detailed Summary Report such as "WindowEnergyReportMonthly" there are several window energy results listed for each window surface:

  • Surface Window Transmitted Solar Radiation Energy (SumOrAverage)
  • Surface Window Transmitted Beam Solar Radiation Rate Energy (SumOrAverage)
  • Surface Window Transmitted Diffuse Solar Radiation Energy (SumOrAverage)
  • Surface Window Heat Gain Energy (SumOrAverage)
  • Surface Window Heat Loss Energy (SumOrAverage)

My questions is: does the "Surface Window Heat Gain Energy" result include the Transmitted Solar Radiation Energy in addition to any conductive/convective gains (is it a sum of all the monthly heat gains)? Or does it NOT include this transmitted solar gain and only represent conductive / convective gains?

I wasn't sure where to find a detailed description of the Output variable types for these reports and what exactly they include / exclude. Just looking at the results of my model it seems that this field does NOT include the solar gains, but I just wanted to be sure.

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answered 2017-02-17 01:29:27 -0500

You should use energyplus docs for clarification:

Surface Window Heat Gain Energy [J]

The total heat flow to the zone from the glazing, frame and divider of an exterior window when the total heat flow is positive.

For a window without an interior shading device, this heat flow is equal to:

[Surface Window Transmitted Solar Radiation Rate (see definition, above)]

[Convective heat flow to the zone from the zone side of the glazing]

[Net IR heat flow to the zone from zone side of the glazing]

[Short-wave radiation from zone transmitted back out the window]

[Convection to zone from window frame and divider, if present]

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Asked: 2017-02-16 15:21:10 -0500

Seen: 442 times

Last updated: Feb 18 '17